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There is no guarantee that *src does not contain garbage bits outside the lower nbits, so we need to mask it before the shift-and-assign. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>